Please note that the Arabidopsis eFP Browser and the old Arex
website contain different data.

The Arabidopsis eFP Browser presents the output of an algorithm that
incorporates the spatial (cell type-GFP marked expression) data and
temporal/longitudinal data. This algorithm infers the expression of
individual cell types at different time points.
Please, look at
Cartwright et al., 2009
for more details.

In the old Arex website, which you might have used in the past,
normalized expression values from the cell type-GFP marked sorted lines
were presented. This is the raw data from single cell types
with no temporal information.